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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2c59308a1bef99199cbad360efa769fcfe998659cb6141b6cb8f311a0d87674a' 
  AND token = 'tWC9OjiSnx2SMiFyOvMf4BAOnWr6P14A4YpMk+z+QUg=' 
  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"
    }
  }
}