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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '980c8d1f7d6b7f81bc5f1638a672490993b0c2dbbb4298bb828d778970953317' 
  AND token = 'kjbhPwKGx0cErO9Uv9R9hQFCDt8S3Mgtb2UDR+IAcvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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