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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32c96d75ec83836e5d622c39d45121444629cae8ca3d5348afd585d03a726b5' 
  AND token = '+ugV0p+T9xxyf6gRUSi9sooRHui0fXMjAVdfr2qEaUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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