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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72de601a35cbe7f6537c7b2c46cc77efd80584b02c6439ba4bdd8b1cbf8513a4' 
  AND token = 'tcUNSPLJCMgG52l8FDSn5CsC81ztmjMjsqYMzZ8Hetw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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