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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfef73a2e8f58e2e61bd4e73c5ff5a04accf2789081ac0fe1f27e2c9dad0688' 
  AND token = '5FUMBkA6oeQ+ZgMzKVEsg7K9n/MRdvB9rEgBiPWtxFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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