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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a96c184975527be0d62483e1981b9df68ee4096001f598cd8add883955434272' 
  AND token = 'J9kMUUMpOLhtP06IpK8VCNb9c0OIKjdIkzOd9Fm/VN4=' 
  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"
    }
  }
}