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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f6be872950254d63552543f76c2663c98b370d5a3f7952b06ecd61ee7aa688' 
  AND token = 'X9+oeTbpOIZx1TXaWbTXkV9ORo70ivU5bigG0vdydc4=' 
  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"
    }
  }
}