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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b06b9db66c3401c0af3f173f249f2e37f3944ef0f961bbeaaa3cd6daf3415252' 
  AND token = 'xRbIvaDFFYZNpF7kQ8ROdbpc6jkjv+lc12I8Zj528SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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