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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d915b7a2e70de320912b53cba28efefddc3f5f74a5428fb851a2e4dae11fff9' 
  AND token = 'rjhzrUO8qvfcBH4Cv/osfM9oGv0DonOCK+MTw3t+p2Y=' 
  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"
    }
  }
}