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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8ba60988be4df61b1b6387bc6eb5f3a3c194584d73f2208f46c21c06d16ca2' 
  AND token = 'Q92NV7oaqcJ5y8Gq2UdyjfzC8JkVbCP7g9xqRhiHmpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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