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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e37bd497d1bf4c2e7ed7b46f4e08b58df86e0333652be7a84c8398c88c1ab9' 
  AND token = 'RsAwUhreY8qdEJ+EiVnKIP7It8JMnmvGyzA344fB59Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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