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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6578e3a210efbfe0e20c4faf669936dd9dc6f7bbaa0e8a9936a22a095afb39' 
  AND token = '3sQS0YVze2t1cResISgao5o+c9YbvAJRCXHWT6rUIMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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