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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8728fb0bd1a5916e351d835072a7caf3625082e65d2aac97e5b9ea8989b4a985' 
  AND token = 'Pa8t9Ld9OMT+pRJ/2tnHYXQMkxaXRQn7JcuMqI56ZZw=' 
  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"
    }
  }
}