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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2438d6da9d1b1c8e4d5f4c4a98cdfcb054488a16adf443c0b9111794de0049de' 
  AND token = 'Lb5fuO72Lv1N3n3nykt2mEb8qaUv//Bft0QglxMEkT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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