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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82997613bb8f4a943cd0f584d3b44b89e9ad9b840a5e3497a2eba7e52595ff09' 
  AND token = 'j+BcCD++sf9Jd+w+emFmbEY5s3y3+sMHs/HaZPWFLxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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