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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06186ad91a0e214f01d576ff298dcf64a5420f917f6740c3cac268c6ca767451' 
  AND token = 'xb66di1JmizLZXodwlB1163AMeu5p0Nn/DKI3Qakz5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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