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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '42f7122f074c00e6cb8731b24c919fc1b35e98ef15e61c92376eede33c4e3b09' 
  AND token = 'hdDuSw13x7ENm2AD8Oc7DgBgjD1NbAtCJ4qJF2GpyLY=' 
  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"
    }
  }
}