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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3ab8d648e1f8059a0a593c0e1c33adeed9dd4218cc71fcf657a4f725e6cd49' 
  AND token = 'yvixrz8O/k7GqOugdveDCdptHtutEGw9tz3yeUQkkr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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