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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abe20784059253f1e021eae7d59397b50e1acd2fd9cdc9077fb1af0ccf954fb' 
  AND token = 'EZQi6ZgPmonMWzCoWj6fw7BRwrTvLW6Ejvu6TP/umCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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