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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49458a9d6d320bfbd618f67d036f20d51d60e47a1ba211a2ecb5d0bfa5e34f06' 
  AND token = 'aCBpZ+B6ailm2xgr4eKOPwR7hik0GOSPI0wJz3QqkdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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