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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4a9177346317f36811073527efaed707e4dc593b72046e956440ca31af8408e7' 
  AND token = 'i6OSk7TZWR3blY3U7wkvPzrb8AGmcfMCcYJoQ5iFJkQ=' 
  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"
    }
  }
}