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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1513b3300596ceb3a1dc0c2f29f0438d5512cf0243c9eeb83afe8b0809992ed6' 
  AND token = 'yy00SiUviEuidR/1F1P18ilq1wjIte6P09SMBUvKszg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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