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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca105f1435d89981b9e589e8771876a010e01ad1097e7c2bc1549b584d709fa2' 
  AND token = 'YZSBt+lzwAWzIvly7GtN1OTom8O7qgr8Fp8wilgMw6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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