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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cb7fb79880f56adef253c9c6a0c821cbc975f77770dff18a87e79edfa60fba' 
  AND token = 'msjRT/Sh+ng0TeFIwVWpzKclthaSHY1LC7DLn0A6VLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}