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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0039ef363904878f6cd5f48e535bf6ad8e85fa57451b41229d387f4508bca74d' 
  AND token = 'tlM6uk6QDdEeJviH48Bk9CjKOy/ttalqr+A5UO9UrJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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