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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '743edf0dcb759bcd39716fa24af7160e7de92f59c3f2f90f3c70dbde36a51f83' 
  AND token = 'VLyg8Aafw5NPShRG9vW02zQYrF5nN8QMuC5nO8Y3AE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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