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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2601fe8394e3bacfc89d5e02fc2b0022176b40fa1d316c93a155622401af2dd' 
  AND token = 'g2kCv95ej+WuW6jmbMLx3XQUXQuDTpE0k/E5kAWi0jw=' 
  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"
    }
  }
}