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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b9fc250ee57c05371a0ed6f122b7861b4fed03b8734d47ddd6c915cdf6bef849' 
  AND token = '8zTcAxo8qqxDamORO0d+znd3qvz51r8AOJC4nhOEgAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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