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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7bc052ddd598a8b6e8f9c1d920071c1148525243bd2376482e183d9b0a65a46' 
  AND token = 'BZQszp7Cvw/yRZ34f/mq7aAPikMi0xbbqnrdWNlmC6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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