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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4484b2302a11fbd15fc8399490b83290a88a4b52c010d455bae2f1950fc16665' 
  AND token = 'mVfseJxJVAnlvbxVpLE2CpIdwgZAqqHIrSurbOqy838=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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