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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a80b36f52fa3c854560c21029ffe43922065ea763e4d62efe28c2563d1e6f808' 
  AND token = '/uI1yT6thvsKIHw3jr7l35Tn8sA6NjmWScxw947Bcv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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