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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd8f79d9f710674e49d93132ec83fd0422f3247745f6c17ce6efcd2f7d57d9c' 
  AND token = '/5esxftB+TaNPYRwvTx4u8DAwGeLXNUVz0Qh1Nz2Ouk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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