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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f7c7a404abcff19c393c3196ac9ebf0be4741f71c49df1c70e58062437aa88e0' 
  AND token = '8XexxLZ7nG1/dbyqvLnOHKpBsYPb4zYsmUmK/JED0LY=' 
  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"
    }
  }
}