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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0043ad87b80b0b091d5de87ebfc78ae1607bc2ab9509778bb6dd72607c5e15c' 
  AND token = 'v66baonYEyum7WPXtk0YOF7xW0OkR8Tl0q+2mbQLDK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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