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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2982a5e890e5ea5ce25e8be7e3f4ec426bb61765fcc615868865012b3eec02fa' 
  AND token = '5EnDjE4TUAGUZMTg76Gs6DLZVMWyTEEr937NSYMwRKo=' 
  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"
    }
  }
}