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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fc683227c2ea5d039d3d65355d815ab1a275727ce0b034d84d8ea12ed8f0433c' 
  AND token = 'gxWUvpga467aPwUJ2J7TnBndqmiqJhL8AOj7KUIEChI=' 
  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"
    }
  }
}