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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b1aa8a86a74340b9aee438a5d7ff5dfe884276aa0cccbec94be54670bbf135' 
  AND token = 'HCbycPmjIBHW8iJYM/zg/YvOPWsJySsYQMJccC13ncs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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