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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5299d3bfe9a64503c7f1cb620db7d68f54bd6bf803d2a9a82fe2d47ff5751d6a' 
  AND token = '9C1A3t4CQ8/L36Jd4RS3czYH7ZizVMRLzD9ec6GKDrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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