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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fd626c231f4eb4c24fd296e3937ed4d7e9ec5e1b8fd07eb47a5b3cadd5cd070d' 
  AND token = 'NXwVmxki7DGUrCfQmZxbgVHizA4zkGkq5yEhquGw0lE=' 
  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"
    }
  }
}