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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e87ff6c23489106bb972c36162c9d75aa88f6e1c59ac2d1263df26bd0477a279' 
  AND token = 'guMPqOle42piOhQFztf4R9NVsbEtUqkxCt1cwre35OQ=' 
  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"
    }
  }
}