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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7966cc8e5d81ba67d1a332b719730a005f36a18a45f7e619ab1aaac67c3a0fd1' 
  AND token = 'lVBdwuzA9XAKriTupaphGr0FFT+P6BkYu0fA1HCP/nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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