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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287a2ecb68e95a9c3c2f48c4bc189972e103a59a99d1124051091819945b7c24' 
  AND token = 'j6CtRSjSfhpJHiG7AzX4cCxMV2CS14GrerSmyrt5D9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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