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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8aef0ddd87047d5ce1f6de0ce2a4b6714bb1a9039a47fa80a281b5ed0ff744' 
  AND token = 'fGBKOijPkgZLnb7DgjKkUTLzA20TsAHtpCi0uxLM0zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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