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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9852c36f9f98398542c95f09a8c960d4f139c73128c70aaa16da3a07fa03d5' 
  AND token = 'urVvBJwWaTOTgKelvGVlnnUZAwv+tJOIr9c7TJdrTfk=' 
  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"
    }
  }
}