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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b54caee90949caf390dc884518981d661026f4380e2f3ef6ce0821e5236fa0fe' 
  AND token = 'rLogUGCyAK1+J0fk1VS9MYmn67A3zInKuiuRc1oMS8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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