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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a087d608acd0beba9a459c0ed44de7f03e49083a9654fbcd93e683593d2e575e' 
  AND token = 'p6Y0D9sxpoS3sHoTfxEchB+MPR3bwF27KSdPwnaAMWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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