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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9472c2b270ac1c27e69a7ff78687d8c3a2ea193a9d8585e2956e596d90b93958' 
  AND token = 't4tFlA+LGbD2oSFp/rQAEApBrtgGVxusgbqIEM7IZn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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