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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd4f15f6246f1ce78589afcafac54659404ee3c55fdeb7434ed32f8300db7003c' 
  AND token = 'Q0pOGgC66W699MEdXxZ3fCRUB0Hz9DuG2Eol+MIVOhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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